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351 lines
6.4 KiB
351 lines
6.4 KiB
10 years ago
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; Zapojeni (Připojen DMC-50399 v 4-bitovem modu):
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; +------u------+
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; Vcc -> reset --+ /RST Vcc +-- napajeni +5V
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; --+ PD0 PB7 +-- RS (0=instr W, BF+addr R; 1=data W/R)
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; --+ PD1 PB6 +-- R/W (1=read,0=write)
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; --+ PA1 PB5 +-- E (clock, active falling edge)
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; --+ PA0 PB4 +--
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; --+ PD2 PB3 +-- DATA 7
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; --+ PD3 PB2 +-- DATA 6
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; --+ PD4 PB1 +-- DATA 5
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; --+ PD5 PB0 +-- DATA 4
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; GND --+ GND PD6 +--
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; +-------------+
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;DMC-50399:
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; 1 - GND
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; 2 - +5V
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; 3 - 0V (lcd driver)
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; 4 - RS
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; 5 - R/W
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; 6 - E
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; 7 - DATA 0
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; 8 - DATA 1
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;...
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;14 - DATA 7
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.device attiny2313
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;běží na 4MHz, ckdiv8=1 (vypnuto)
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;250x16=1ms=1000us
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;LFUSE: 0xE2 -U lfuse:w:0xE2:m
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;HFUSE: 0xDF -U hfuse:w:0xDF:m
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;K O N S T A N T Y + P R E Z D I V K Y P O R T U A P I N U
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.equ LCDPORT = PORTB
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.equ LCDPIN = PINB
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.equ LCDDDR = DDRB
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.equ RS = 7
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.equ RW = 6
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.equ E = 5
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.equ LCD_CLEAR = 0b00000001
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.equ LCD_HOME = 0b00000010
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.equ LCD_MODE_INC_NOSHIFT = 0b00000110
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.equ LCD_MODE_INC_SHIFT = 0b00000111
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.equ LCD_MODE_DEC_NOSHIFT = 0b00000100
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.equ LCD_MODE_DEC_SHIFT = 0b00000101
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.equ LCD_DISPLAY_DISABLED = 0b00001000
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.equ LCD_DISPLAY_NOCURSOR = 0b00001100
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.equ LCD_DISPLAY_CURSOR = 0b00001110
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.equ LCD_DISPLAY_ALTER = 0b00001101
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.equ LCD_DISPLAY_CURSOR_ALTER = 0b00001111
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.equ LCD_CURSOR_LEFT = 0b00010000
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.equ LCD_CURSOR_RIGHT = 0b00010100
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.equ LCD_SHIFT_LEFT = 0b00011000
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.equ LCD_SHIFT_RIGHT = 0b00011100
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;5x7 font, 1-line
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.equ LCD_MODE_4BIT_1LINE = 0b00100000
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;.equ LCD_MODE_8BIT_1LINE = 0b00110000
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;5x7 font, 2-line
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.equ LCD_MODE_4BIT_2LINE = 0b00101000
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;.equ LCD_MODE_8BIT_2LINE = 0b00111000
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.equ ROW1_ADDR = 0x00
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.equ ROW2_ADDR = 0x40
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.equ ROW3_ADDR = 0x14
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.equ ROW4_ADDR = 0x54
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;aliases
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.def ZH = r31
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.def ZL = r30
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.def YH = r29
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.def YL = r28
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.def XH = r27
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.def XL = r26
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; Z A C A T E K P R O G R A M U
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;vektory preruseni
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.org 0x0000 ;RESET
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rjmp RESET ;skok na start po resetu
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.org 0x0013
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;nastaveni po resetu
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.DB "HD44780 INTERFACE" ;(nazev programu)
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RESET:
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ldi r16,low(RAMEND) ;nastavi stack pointer
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out SPL,r16
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cli ;zakazat vsechna preruseni
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; Nastaveni portu
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;PORTB = LCDPORT
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ldi r16,0b11111111 ;smer portu B
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out LCDDDR,r16
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ldi r16,0b00000000 ;vypnout B
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out LCDPORT,r16
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sei ;Global Interrupt Enable
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; == display init ==
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rcall LCD_INIT
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ldi r17,LCD_MODE_INC_NOSHIFT
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rcall TX_INSTR
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ldi r17,LCD_DISPLAY_NOCURSOR
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rcall TX_INSTR
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; == load user-defined characters to CGRAM == (default, array label named MYCHARS, end-mark=0xFE)
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ldi r17,0
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rcall CGRAM_SET_ADDR
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ldi ZH,high(MYCHARS*2)
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ldi ZL,low(MYCHARS*2)
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CGRAM_loop:
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lpm r17,Z+
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cpi r17,0xFE
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breq CGRAM_loop_end
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rcall TX_DATA
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rjmp CGRAM_loop
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CGRAM_loop_end:
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; == pgm body ==
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;load text to DDRAM
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ldi r17,ROW1_ADDR
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rcall DDRAM_SET_ADDR
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ldi ZH,high(MYTEXT1*2)
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ldi ZL,low(MYTEXT1*2)
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DDRAM_loop:
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lpm r17,Z+
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cpi r17,0xFE
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breq DDRAM_loop_end
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rcall TX_DATA
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rjmp DDRAM_loop
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DDRAM_loop_end:
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;load text to DDRAM
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ldi r17,ROW2_ADDR
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rcall DDRAM_SET_ADDR
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ldi ZH,high(MYTEXT2*2)
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ldi ZL,low(MYTEXT2*2)
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DDRAM2_loop:
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lpm r17,Z+
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cpi r17,0xFE
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breq DDRAM2_loop_end
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rcall TX_DATA
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rjmp DDRAM2_loop
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DDRAM2_loop_end:
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;direct write to X,Y - example
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ldi r16,3 ;Y, zacina 0 a roste smerem dolu
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ldi r17,5 ;X, zacina nulou a roste smerem doprava
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rcall LCD_CURSOR_XY
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ldi r17,"%"
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rcall TX_DATA
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ldi r17,"%"
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rcall TX_DATA
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ldi r17,"%"
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rcall TX_DATA
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;infinite loop
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loop: rjmp loop
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MYTEXT1:
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.DB 0,0,0," POKUSNY TEXT ",0,0,0,0xFE
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MYTEXT2:
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.DB "Opravdu pekny text!",0xFE
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; == USER-DEFINED CHARS ==
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MYCHARS:
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; 5x8, first 3 bits are not used
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;end of mychars
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.DB 0xe,0x1f,0x15,0x1f,0x1f,0x1f,0x15 ;smajlik
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;konec
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.DB 0xFE
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;r16=Y
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;r17=X
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LCD_CURSOR_XY:
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cpi r16,0
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brne test1
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fail: ldi r16,ROW1_ADDR
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rjmp addrdone
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test1:
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cpi r16,1
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brne test2
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ldi r16,ROW2_ADDR
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rjmp addrdone
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test2:
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cpi r16,2
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brne test3
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ldi r16,ROW3_ADDR
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rjmp addrdone
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test3:
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cpi r16,3
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brne fail
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ldi r16,ROW4_ADDR
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addrdone:
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add r17,r16
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rcall DDRAM_SET_ADDR
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ret
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;r16=počet ms (cca)
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delay:
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push r17 ;2
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push r18 ;2
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d1:
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ldi r17,250 ;1
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d2:
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ldi r18,14 ;1
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d3:
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dec r18 ;1
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nop
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brne d3 ;2 (1
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dec r17 ; +1)
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brne d2 ;2 (1
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dec r16 ; +1)
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brne d1 ;2 (1)
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pop r18 ;2
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pop r17 ;2
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ret
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LCD_INIT:
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ldi r16,16
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rcall delay
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ldi r16,0b00000010 ;4bit
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out PORTB,r16
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rcall LCD_CLK
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ldi r16,5
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rcall delay
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ldi r17,LCD_MODE_4BIT_2LINE ;set 4-bit mode
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rcall TX_INSTR
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ret
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;r17
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TX_INSTR:
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swap r17 ;send high nibble
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mov r16,r17
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andi r16,0b00001111
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out LCDPORT,r16
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rcall LCD_CLK
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swap r17 ;send low nibble
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mov r16,r17
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andi r16,0b00001111
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out LCDPORT,r16
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rcall LCD_CLK
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ret
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;r17
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TX_DATA:
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swap r17 ;send high nibble
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mov r16,r17
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andi r16,0b00001111
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sbr r16,(1<<RS)
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out LCDPORT,r16
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rcall LCD_CLK
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swap r17 ;send low nibble
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mov r16,r17
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andi r16,0b00001111
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sbr r16,(1<<RS)
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out LCDPORT,r16
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rcall LCD_CLK
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ret
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;r17 disabled to reduce code size
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;RX_DATA:
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; ;input
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; ldi r16,0b11110000 ;LCDPORT dirrection (RS RW E n.c.) output, (D7 D6 D5 D4) input
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; out LCDDDR,r16
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; ldi r16,0b00001111 ;pullups to data pins enabled
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; out LCDPORT,r16
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;
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; clr r17
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; ldi r16,(1<<RW)|(1<<RS)
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; out LCDPORT,r16 ;set LCD to read mode, for data
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;
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; rcall LCD_CLK ;receive high nibble
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; in r16,LCDPIN
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; andi r16,0b00001111
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; or r17,r16
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; swap r17 ;store high nibble
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;
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; rcall LCD_CLK ;receive low nibble
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; in r16,LCDPIN
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; andi r16,0b00001111
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; or r17,r16 ;store low nibble
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;
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; ;output
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; ldi r16,0b11111111 ;LCDPORT as output (RS RW E n.c. D7 D6 D5 D4)
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; out LCDDDR,r16
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; ldi r16,0b00000000 ;LCDPORT off
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; out LCDPORT,r16
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;
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; ;r17=received value (D7 D6 D5 D4 D3 D2 D1 D0)
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; ret
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LCD_CLK:
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sbi LCDPORT,E ;EXECUTE on
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nop
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nop
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nop
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cbi LCDPORT,E ;EXECUTE off
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ldi r16,150 ;pause: 100 for 4MHZ
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clkw:
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dec r16
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brne clkw
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ret
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;r17
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;7 bitu (1.radek zacina 00,druhej 40)
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DDRAM_SET_ADDR:
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clr r16
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sbr r16,0b10000000
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or r17,r16
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rcall TX_INSTR
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ret
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;r17
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;6 bitu (5,4,3 = znak, 2,1,0 = radek - shora)
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CGRAM_SET_ADDR:
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clr r16
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sbr r16,0b01000000
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or r17,r16
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rcall TX_INSTR
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ret
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